Cleaned the distributor guts last night and found a fair amount of gummed up old oil/grease - advance was probably not working well. Everything cleaned up well, but the advance cam springs were rusty. These springs show up as a "no longer available" part from MC. Any ideas on automotive substitutes or aftermarket? I know advance springs are available as automotive aftermarket performance parts, but I really don't want to go down the recurving road. Thanks.